Collision Tumour of Ovary: A Report of Two Cases.

Collision tumour is defined as the presence of two distinct tumours in the same organ without any histological intermixing. Such tumours involving ovaries are extremely rare. We are presenting report of two cases of ovarian collision tumour. Our first case revealed features of mature cystic teratoma with mucinous cystadenoma. The second case showed components of both mature cystic teratoma and serous cystadenoma. Correct diagnosis of collision tumour will guide the surgeon towards proper treatment and favorable prognosis of patient.